Figure 1.

Applied methods for breath sampling and testing. a) Glass tube used for breath sampling. The lumen is filled with a polypropylene fleece. b) For breath sampling, study participants exhale through the collection device. c) Test set-up showing the probe retainers. d) The position of the lung cancer samples is randomised. e) Sniffer dogs are trained to identify lung cancer in the breath sample of patients. f) The dogs are trained to indicate a positive test tube by lying on the floor in front of the tube with their muzzle touching the test tube. Reproduced from [8] with permission from the publisher.